3n+6n=90

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Solution for 3n+6n=90 equation: 



3n+6n=90

We move all terms to the left:

3n+6n-(90)=0

We add all the numbers together, and all the variables

9n-90=0

We move all terms containing n to the left, all other terms to the right

9n=90

n=90/9

n=10

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